.header {
  height: 80vh;
}
.navsection {
  margin-bottom: 30px;
  padding: 0 15px;
}

.navtitle {
  color: #000;
  text-align: center;
}

.nav_ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, 210px);
  justify-content: center;
  justify-items: center;
}

.nav_link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  color: #000;
  text-decoration: none;
}

.nav_ul > li {
  position: relative;
  display: grid;
  justify-content: center;
  align-content: center;
  min-width: 200px;
  height: 130px;
  margin: 0 5px 15px;
  text-align: center;
  border: 1px solid #cceff5;
  background: #fafcfd;
  border-radius: 3px;
  cursor: pointer;
}
.nav_ul > li img {
  width: 30%;
}
.logoText {
  font-size: 36px;
  color: rgb(23, 179, 127);
}

.mask::after {
  content: "无内容";
  position: absolute;
  right: 0;
  top: 0;
  width: 55px;
  height: 55px;
  line-height: 45px;
  padding: 0 2px;
  color: rgb(252, 252, 252);
  text-align: right;
  border-bottom-left-radius: 60px;
  background-color: rgba(0, 0, 0, 0.5);
}
.nav_link_box{
  padding-top: 10x;
}
